4个油茶品种的半致死温度与耐热性研究

为探明油茶不同品种对高温的适应性差异，从而为高温、强光地区种植油茶提供理论依据，以油茶一年生功能叶片为试验材料，采用电导率法对‘岑软2号’、‘岑软3号’、‘岑软22号’和‘岑软24号’4个油茶品种的耐热性进行研究。结果表明，随着处理温度的升高，4个油茶品种叶片的细胞伤害率增长速度均呈现“慢-快-慢”的趋势，呈典型“S”型曲线，显著性检验均符合Logistic方程。通过计算“S”型曲线拐点求得4个油茶品种的半致死温度都超过了50.0℃，这表明4个品种都有一定的高温适应性，其中‘岑软3号’的半致死温度最高，达到58.5℃，‘岑软2号’的高温半致死温度最低为53.1℃，4个油茶品种耐高温能力由强到弱依次为‘岑软3号’>‘岑软22号’>‘岑软24号’>‘岑软2号’。

The Study on Semi-lethal High Temperature and Heat Tolerance of Four Camellia oleifera Abel Clones

Ab To detect the adaptability difference under high temperature of different Camellia oleifera species, as well as provide a theoretical basis for high temperature and highlight area, annual leaf segments of four Camellia oleifera clones （‘CenRuan 2＇, ‘CenRuan 3＇, ‘CenRuan 22＇ and ‘CenRuan 24＇） were used to study the heat tolerance by electrical conductivity method. The results showed that with the rise of treated temperature, cell hurt rate of leaf segments from four clone Camellia species was increased with trend of ‘slow-fast-slow＇, showed typical ‘S＇ curve, the significance test of which was fit Logistic equation. The semi-lethal high temperature LTso which calculated from ‘S＇ model curve break point of four clone Camellia species was exceed 50.0℃, which indicated that all four species had certain adaptability. Among them, LTs0 of ‘CenRuan 3＇ was highest （58.5℃）. LT50 of ‘CenRuan 2＇ was lowest （53.1℃）. The heat resistance of the four oil-tea Camellia species followed the order：‘CenRuan 3＇ 〉‘ CenRuan 22＇ 〉‘ CenRuan 24＇ 〉‘ CenRuan 2＇, respectively.